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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Thu, 9 Feb 2012 12:02:03 -0700
Subject: Re: Apparent "double imports" (was: Naming convention for in-house modules (Newbie question))
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On Thu, Feb 9, 2012 at 11:53 AM, HoneyMonster <someone@someplace.invalid> wrote:
> One issue I have run into, which may or may not be a problem: I am
> finding that modules in the in-house "library" package sometimes have to
> import modules like sys and os, which are also imported by the "calling"
> module. Is this a problem or an overhead, or does it just result in two
> names for the same object?

Two names for the same object.  When a module is imported, the module
object is stored in the sys.modules dict.  Further imports of the same
module just return the same module object from sys.modules.